Fixed build errors on other platforms. This is a headache and a half :D I should split the files into strsafe_vsnprintf and strsafe_strncpy, but I want to share this file as is in one piece for now.

common/uipriv.h

@@ -1,5 +1,7 @@
 // 19 april 2019
 
+#include <stdarg.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif

sharedbits/strsafe_impl.h

@@ -15,6 +15,7 @@ extern
 void sharedbitsprivInternalError(const char *fmt, ...);
 #endif
 
+#ifndef sharedbitsNoVsnprintf
 #ifdef sharedbitsStatic
 sharedbitsStatic
 #endif
@@ -35,6 +36,7 @@ int sharedbitsPrefixName(Vsnprintf)(char *s, size_t n, const char *fmt, va_list
 	return vsnprintf(s, n, fmt, ap);
 #endif
 }
+#endif
 
 #ifdef sharedbitsStatic
 sharedbitsStatic

test/main.c

@@ -64,5 +64,6 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 	printf("PASS\n");
+	fflush(stdout);		// AddressSanitizer can chop the tail end of the output for whatever reason
 	return 0;
 }

test/noinitwrongthread.c

@@ -23,10 +23,8 @@ static char caseErrorEncodingError[] = "encoding error while handling other case
 
 #define sharedbitsPrefix priv
 #define sharedbitsStatic static
-#include "../../sharedbits/strsafe_impl.h"
-#undef sharedbitsStatic
-#undef sharedbitsPrefix
-
+// do this conditionally to avoid warnings on non-Windows
+#ifdef _WIN32
 static void privInternalError(const char *fmt, ...)
 {
 	va_list ap, ap2;
@@ -50,6 +48,17 @@ static void privInternalError(const char *fmt, ...)
 	privVsnprintf(caseError, n + 1, fmt, ap);
 	va_end(ap);
 }
+#else
+#define sharedbitsInternalError
+#define sharedbitsNoVsnprintf
+#endif
+#include "../../sharedbits/strsafe_impl.h"
+#ifndef _WIN32
+#undef sharedbitsNoVsnprintf
+#undef sharedbitsInternalError
+#endif
+#undef sharedbitsStatic
+#undef sharedbitsPrefix
 
 static void catalogProgrammerError(const char *prefix, const char *msg, const char *suffix, bool internal)
 {